1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* lib/krb5/krb/rd_req.c
*
* Copyright 1990,1991, 2008 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_rd_req()
*/
#include "k5-int.h"
#include "auth_con.h"
/*
* Parses a KRB_AP_REQ message, returning its contents.
*
* server specifies the expected server's name for the ticket.
*
* keyproc specifies a procedure to generate a decryption key for the
* ticket. If keyproc is non-NULL, keyprocarg is passed to it, and the result
* used as a decryption key. If keyproc is NULL, then fetchfrom is checked;
* if it is non-NULL, it specifies a parameter name from which to retrieve the
* decryption key. If fetchfrom is NULL, then the default key store is
* consulted.
*
* returns system errors, encryption errors, replay errors
*/
krb5_error_code KRB5_CALLCONV
krb5_rd_req(krb5_context context, krb5_auth_context *auth_context,
const krb5_data *inbuf, krb5_const_principal server,
krb5_keytab keytab, krb5_flags *ap_req_options,
krb5_ticket **ticket)
{
krb5_error_code retval;
krb5_ap_req * request;
krb5_auth_context new_auth_context;
krb5_keytab new_keytab = NULL;
if (!krb5_is_ap_req(inbuf))
return KRB5KRB_AP_ERR_MSG_TYPE;
#ifndef LEAN_CLIENT
if ((retval = decode_krb5_ap_req(inbuf, &request))) {
switch (retval) {
case KRB5_BADMSGTYPE:
return KRB5KRB_AP_ERR_BADVERSION;
default:
return(retval);
}
}
#endif /* LEAN_CLIENT */
/* Get an auth context if necessary. */
new_auth_context = NULL;
if (*auth_context == NULL) {
if ((retval = krb5_auth_con_init(context, &new_auth_context)))
goto cleanup_request;
*auth_context = new_auth_context;
}
if (!server) {
server = request->ticket->server;
}
/* Get an rcache if necessary. */
if (((*auth_context)->rcache == NULL)
&& ((*auth_context)->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME)
&& server) {
if ((retval = krb5_get_server_rcache(context,
krb5_princ_component(context,
server,0),
&(*auth_context)->rcache)))
goto cleanup_auth_context;
}
#ifndef LEAN_CLIENT
/* Get a keytab if necessary. */
if (keytab == NULL) {
if ((retval = krb5_kt_default(context, &new_keytab)))
goto cleanup_auth_context;
keytab = new_keytab;
}
#endif /* LEAN_CLIENT */
retval = krb5_rd_req_decoded(context, auth_context, request, server,
keytab, ap_req_options, ticket);
#ifndef LEAN_CLIENT
if (new_keytab != NULL)
(void) krb5_kt_close(context, new_keytab);
#endif /* LEAN_CLIENT */
cleanup_auth_context:
if (new_auth_context && retval) {
krb5_auth_con_free(context, new_auth_context);
*auth_context = NULL;
}
cleanup_request:
krb5_free_ap_req(context, request);
return retval;
}
|
